VBI-C-24kV Indoor Side Mounted Vacuum Circuit Breaker with VBI Spring Operating Mechanism
The VBI-C-24kV indoor side-mounted vacuum circuit breaker is a high-performance unit designed for the control and protection of power grids rated up to 24kV. Equipped with a robust VBI spring operating mechanism, it supports both manual and electrical operations and is ideal for environments requiring frequent switching and high reliability. This VCB fully meets the requirements for automatic reclosing and offers a maintenance-free, long service life in air-insulated indoor switchgear.
VBI-C-24kV Indoor Side Mounted Vacuum Circuit Breaker
Product Overview
The VBI-C-24kV indoor side-mounted vacuum circuit breaker is an advanced medium-voltage protection unit designed for air-insulated indoor switchgear. Rated for power grids up to 24kV, this breaker is engineered for reliability in environments requiring frequent switching or the breaking of short-circuit and normal load currents. Its side-mounted design and robust construction make it an ideal choice for modern industrial and substation power systems.
Advanced VBI Operating Mechanism
This series is equipped with a dedicated VBI spring energy storage operating mechanism:
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Dual Operation Modes: Supports both manual and electrical charging and switching operations for maximum flexibility on-site.
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High Capability Grade: Reaches the M-E2-C2 grade, ensuring superior mechanical and electrical endurance.
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Integrated Safety: The front panel features clear “I” (Close) and “O” (Open) indicators, an energy storage status window, and an operation counter.
Technical Specifications
| Item | Unit | Technical Data |
| Rated Voltage | kV | 24 |
| Power Frequency Withstand Voltage (1min) | kV | 65 |
| Rated Lightning Impulse Withstand Voltage (Peak) | kV | 125 |
| Contact Opening Distance | mm | 12 ± 1 |
| Overtravel | mm | 3 ± 0.5 |
| Opening Time | ms | ≤ 50 |
| Closing Time | ms | ≤ 100 |
| Distance Between Phases | mm | 210 ± 1 |
| Contact Closing Bounce Time | ms | ≤ 2 |
Key Features & Benefits
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Enhanced Protection: Available with insulating cylinders or embedded poles to protect the vacuum interrupter from dust, moisture, and external impact.
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Automatic Reclosing: Fully compatible with power system requirements for automatic reclosing, ensuring minimal downtime.
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Standards Compliance: Manufactured in strict accordance with GB1984-89, JB3855-96, and IEC56 international standards.
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Maintenance-Free Design: The simple yet stable structure minimizes the need for regular servicing, reducing long-term operational costs.
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